Effect of translational temperature anisotropy on the rotational distribution of N2 in the Ar free jet

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Abstract
The effect of the translational temperature anisotropy T∥≳T⊥ on the rotational distribution yj, temperature Tr, and collision number Zr of N2 in the Ar free jet is studied at the lower density level P0d = 15 Torr-mm using the ellipsoidal velocity distribution and the rotational transition cross section of the power law. The effect of T∥≳T⊥ is appreciable. The overpopulation of the higher rotational levels j above the Boltzmann distribution fitted to the distribution of the lower j, i.e., the degree of nonequilibrium for the case T∥≳T⊥ = Ti (i≡isentropic) is slightly less pronounced than for the case T∥ = T⊥ = Ti but more pronounced than for the case T∥ = T⊥≳Ti. The ratio yj/y0, Tr, and the terminal Zr for T∥≳T⊥ = Ti are larger than for T∥ = T⊥ = Ti but smaller than for T∥ = T⊥≳Ti.